EP2194358B1 - Measurement method and device for thread parameters - Google Patents

Measurement method and device for thread parameters Download PDF

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Publication number
EP2194358B1
EP2194358B1 EP08170841A EP08170841A EP2194358B1 EP 2194358 B1 EP2194358 B1 EP 2194358B1 EP 08170841 A EP08170841 A EP 08170841A EP 08170841 A EP08170841 A EP 08170841A EP 2194358 B1 EP2194358 B1 EP 2194358B1
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EP
European Patent Office
Prior art keywords
thread
reference system
spatial reference
data
trajectory
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Revoked
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EP08170841A
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German (de)
English (en)
French (fr)
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EP2194358A1 (en
Inventor
Nicolas Hernan Bonadeo
Sebastian Berra
Javier Ignacio Etcheverry
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Tenaris Connections Ltd
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Tenaris Connections AG
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Application filed by Tenaris Connections AG filed Critical Tenaris Connections AG
Priority to EP08170841A priority Critical patent/EP2194358B1/en
Priority to EP09795954A priority patent/EP2373953B1/en
Priority to CN200980149000.5A priority patent/CN102239385B/zh
Priority to BRPI0923148-0A priority patent/BRPI0923148B1/pt
Priority to JP2011539025A priority patent/JP5937356B2/ja
Priority to RU2011127489/28A priority patent/RU2477453C1/ru
Priority to PCT/EP2009/066309 priority patent/WO2010063792A1/en
Priority to CA2746712A priority patent/CA2746712C/en
Priority to US13/131,851 priority patent/US8682465B2/en
Priority to MX2011005946A priority patent/MX2011005946A/es
Priority to ARP090104701A priority patent/AR074546A1/es
Publication of EP2194358A1 publication Critical patent/EP2194358A1/en
Publication of EP2194358B1 publication Critical patent/EP2194358B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/2425—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures of screw-threads

Definitions

  • the present invention relates to a measurement method for threading, especially suited for threaded pipes used in the hydrocarbon industry and for similar threaded objects.
  • a main problem in performing the measurement operations for quality control is the precision and repeatability of measurements.
  • document US 5 521 707 discloses a non-contact laser-based sensor guided by a precision mechanical system which scans a thread profile and produces a set of computer images of the threading. The computer images are then analyzed to acquire quantitative information about thread characteristics such as pitch, lead, root radius, flank angle, surface roughness, helix variation, and pitch diameter. That document however has the disadvantage that it does not address explicitly the important problem of piece misalignment and therefore it requires an absolute precision of the operations when aligning the piece to be measured with the mechanical system coordinates. This alignment can only be achieved when the piece is at the threading machine.
  • Measuring at the threading machine has several disadvantages; it adds costly time to the threading process by preventing the inspection and manufacturing process from running in parallel, it requires placing delicate optics and precise mechanical components in a hostile environment with cutting oil and strong vibrations present, and to some extent uses the same mechanical movement that has to be verified.
  • this alignment is very difficult to achieve manually and consequently the system disclosed by that document only allows measurement of relative or local magnitudes, i.e. thread height by comparing contiguous crests and roots, whereas errors introduced by a piece misalignment are not "noticed” by that solution and in these cases they produce an insufficiently precise measurement.
  • a main object of the present invention is to provide a method for accurate, automatically performed, non-contact inspection of threaded objects, in particular of oil pipe threads, especially of pins and boxes.
  • trajectory the path the sensor follows through space, describing a sequence of values of the surface location with respect to the sensor.
  • FIG. 1 there is shown a scheme of an automatic thread inspection optical system based on laser displacement sensors, called in short hereafter "measurement" device 1, which has its own Cartesian reference system 2, defined by the orthogonal axes X, Y, Z.
  • a threaded portion of a pin 3 to be measured is shown on the left of the figure.
  • This pin has its own Cartesian reference system 4 defined by the orthogonal axes X', Y', Z'.
  • the pin is positioned far from the measurement device in a rest position on a bench 6.
  • a pin 3 is mounted on the measurement device 1 to perform the measurement operations according to the invention, the respective pin and measurement device 1 reference systems are placed as close as technically possible one to each other using the horizontal and vertical angular and lateral displacement movements provided by the device (see fig1 ). Nevertheless, despite all possible care, the two reference systems will not coincide exactly and small misalignments, both in the angular and in the lateral position of the reference system 2 of the pipe, with respect to the measurement device may still exist.
  • the measurement device 1 comprises two laser displacement sensors 5' and 5" mounted on a yoke piece advantageously machined from a single aluminium piece to minimize mechanical movements.
  • This piece or head is mounted on a rotational stage, able to pivot about a U-axis, and belongs to the head of the measurement device, together with the laser sensors 5' and 5".
  • Each sensor 5', 5" is mounted on an X stage that can be moved in the radial direction (X axis), by means of linear rotary motors. Angular and linear movement of these stages parallel to the Y axis, orthogonal to the X axis; allows the stage to be aligned along the same line.
  • Both laser sensors 5' and 5" can also be adjusted by lateral and angular displacement to align the center of the laser emission with respect to the center of rotation of the device.
  • the stage X in addition can be motorized so that it can be used for an automatic change of product diameter while maintaining the sensors always within their range.
  • a linear stage, (moving along the Z axis) that allows displacing the head parallel to the device axis Z.
  • the linear stage movable along the Z axis, is mounted on a base that is hardcoated on the bottom to allow smooth displacement with respect to the base when the device is set up for the first time, figure 1a .
  • Four knobs e.g. placed one on each corner, allow for horizontal angular and lateral displacement in a plane.
  • screws, or equivalent means to fix the whole structure to avoid movement once the initial alignment has been accomplished.
  • a wedged pad on each of the four legs to regulate height and out-of-plane angular alignment.
  • Figure 2 shows, by means of a flowchart, the general working scheme of the data acquisition procedure governing the whole measurement process once the initial calibration and plant installation has been performed. It starts by verifying that the pipe is in position aligned to the measurement device, then the measurement device executes a first longitudinal scanning operation along the threaded portion of the pipe to find the relative position of the pipe nose with respect to the frame of reference of the measurement device. After the relative position of the nose is detected, all distances reported during measurement are referred to that point. If the measurement operation of the threaded pipe provides for only one scanning operation, the data are gathered only in correspondence with points belonging to the path followed by the sensors 5' and 5". This is generally done because the data collected are considered sufficient to the needs of the users.
  • the measurement procedure on the threaded object provides for several scanning operations along several trajectories on the surface of the threaded portion, data are also collected on predefined points along these trajectories.
  • the choice of the measurement points where data are gathered is made in such a manner that a matrix that describes the quadratic form has maximum rank when values corresponding to these points are inserted in it.
  • a plurality of longitudinal profiles e.g. six are scanned at equally spaced angular steps.
  • Data gathered by means of these scans are processed to remove spurious peaks and pass encoder counts to physical units and are then used to calculate a first estimation of the thread angular misalignment with respect to the measurement device frame of reference and reassign the nose position by averaging the six nose positions corresponding to the six scans.
  • These scanning operations are also used to detect the positions of the crests and roots of the threads and define a spiral trajectory table, by interpolating this information, so as to allow successive scanning operations over the center of the crests or roots of the thread.
  • Data acquired by means of those spiral scanning operations are also conditioned and used to measure more precisely the misalignment in respect of the thread frame of reference.
  • a table for the seal or seals, run in and run out trajectories can be constructed in the reference frame of the piece (X',Y',Z') and transformed to the device coordinate system and executed.
  • the head of the measurement device After the end of the scanning operations, the head of the measurement device returns to its rest position and data analysis begins in order to obtain all the parameters of the thread under test.
  • the first step of the data acquisition is nose detection, which consists in executing a linear scan along the Z-axis between two reference distances where the nose is estimated to be located. It will be appreciated that this linear scan can be the only scanning operation predefined in the measurement method, or it can also be the first scanning operation of a plurality of scanning operations.
  • the signals provided by the laser sensors 5 are further analysed by making a check of the presence or absence of Out Of Range (OOR) values.
  • An OOR value consists of a non-valid point (i.e. out of the physical range of the sensor), as sent by a sensor when no object is found in the measurement range of the sensors. These signals are processed by defining a sampling window of e.g. fifty data points and verifying that all samples are not OOR.
  • the sampling window is then moved one step further and the values of the signals sent are checked again until all samples in that window are recognised as valid data points after processing.
  • the first sample of that block is defined as the nose position of the pin.
  • the graph of Figure 3 shows the results produced by a scan during nose detection. It shows OOR values previous to the encounter of the laser sensors with the pipe nose, the dot 20 indicating the position, with respect to the Z axis, where the nose has been detected. After this point has been detected, scanning is stopped, and the following step of the data acquisition procedure is started.
  • Figure 6 shows a typical longitudinal scan where signals generated by both laser sensors 5', 5", placed at an angular distance of 180° apart, are acquired.
  • the three scans result in six profiles, i.e. two groups of three profiles, each corresponding to one of the laser sensors 5' and 5", of the thread under test, and are useful for giving a first estimation of the thread misalignment.
  • the quantity of scans can also be more or less than three, depending on the object to be measured and depending on the parameters that are sought. In these particular cases, pitch and step height along six generatrices are the parameters sought.
  • Another variant of the measurement method provides for a data acquisition operation consisting of detecting selected points on thread crests and roots made by performing a number of longitudinal scans parallel to the Z axis. Data collected from these scans also enable points to be determined on thread roots and crests that are used for the definition of trajectories along which two subsequent spiral scanning operations are performed, one along the thread crest and the other one along the thread root. By being generated previously in this manner, the trajectory avoids falling off the crest or climbing out of the root during the scanning operation when the object is misaligned with respect to the X', Y', Z' co-ordinate system.
  • the first step of this measurement operation starts by detecting thread load flanks, consisting of detecting load flanks for each longitudinal profile. This is performed by differentiating the whole data vector and evaluating values that override a preset threshold. A vector containing all zero values is generated, excluding those detected points which are candidates for indicating the presence of a load flank. Another vector is generated which represents a theoretical comb with teeth of a specific detection width and nominal pitch separation between the teeth. These two vectors are cross correlated in order to find the relative position between the comb and the load flank 21 candidate vector that maximizes the cross correlation (see fig. 5 ). The cross correlation consists of performing a scalar multiplication of the two vectors and finding the sum of the resulting vector while changing their relative vector index.
  • load flanks 21 are assigned in correspondence with the points found as candidates for each comb tooth according to the following criteria:
  • Figure 7 shows hypothetical load flank candidates and comb vectors in the three mentioned cases possible for assigning loading flanks.
  • Another variant of the measurement method provides for assigning points along crests and roots, wherein the crests and roots segments are defined following the thread mechanical drawings with the parameters Rc, Rc2, Rv and Rv2 as shown in Figure 5 .
  • Each segment is conditioned by filtering OOR and possible peaks taking into consideration that the segment should be a line. Then, the point corresponding to either root or crest is calculated as the mid segment point.
  • Figure 7 shows a longitudinal scan where those points detected as being root and crest points are indicated.
  • Graph (a) shows the candidates for load flanks
  • graph (b) shows the theoretical comb
  • graph (c) shows the cross-correlation
  • graph (d) shows candidates for load flanks
  • graph (e) shows the displaced theoretical comb
  • graph (f) shows assigned load flanks.
  • points are generated by extrapolating the determined points in the threaded portion for location prior to the nose position, and after the end of the thread where the non-machined part of the pipe starts.
  • All the root points determined in each longitudinal scanning operation are also used for fitting a quadric surface representing the cone of the thread being analysed so as to gather a first estimation of the thread angular misalignment with respect to the measurement device reference frame.
  • Crest points are preferably not used in this calculation for two main reasons:
  • the generic matricial form of the quadric surface is described in formula [1].
  • x ⁇ i . A . x ⁇ + b ⁇ . x ⁇ 1
  • x ⁇ [ x , y , z ] i is a point of the quadric in the 3D space
  • A is a symmetric matrix related to the quadric (it is formed by nine parameters, three for translation, three for orientation and three for the quadric form as expressed in a canonic frame) and
  • b is the quadric displacement vector.
  • the selected data is fitted to the expression shown in [1] by using a least squares approximation, from which the parameters of the quadric (e.g. the parameters that conform to A and b ) are obtained.
  • the subsequent operation consists of spiral scannings, both along root and crest of threads.
  • the information acquired before relating to the root and crest mid point positions, for each longitudinal scan, is interpolated and used to build two spiral scanning tables. All of the root mid points are transformed to the thread coordinate frame. Afterwards, a linear fit is performed over the data resulting from a t vs. Z arrangement. Subsequently, a new set of points is generated segmenting the fitted line with a regular step. These points are transformed back to the measurement device reference frame and passed to a controller for the calculation of the servo references. The same procedure is applied on the crest mid points for generating the crest scanning table.
  • the root scan is executed starting from the nose while the crest scanning is executed in the opposite direction, considering the Z-axis.
  • Figure 5 shows a typical root and crest scanning expressed in respect of the measurement device reference frame. Data obtained from the root spiral scan are used to calculate a better estimation of the measurement device to thread misalignment that is also used to recalculate the transformations between reference frames that are applied in the data analysis.
  • Figure 8 shows the t vs. Z graphs for the measurement device reference frame, graph (a), as data are acquired and for the thread reference frame, graph (b) transformed using the misalignment estimation calculated from the spiral scans.
  • the graph (a) of figure 8 shows on the left what the effects of misalignment are on the acquisition procedure.
  • a data acquisition procedure provides for scanning the seal of the thread.
  • an ideal circular trajectory is generated with reference to the thread reference frame at a predetermined distance from the nose and then transformed to the measurement device reference frame for its execution.
  • Figure 9 shows two graphs containing the results of a typical seal scan, where graph (a) shows the scan expressed in the measurement device reference frame and graph (b) shows the scan in the thread reference frame.
  • This scanning trajectory must be executed starting at a predefined distance from the pin nose and in alignment with the threaded object because the nose profile may be complex and the radius measured may be highly dependent on the exact position measured.
  • a good estimation of the nose position is calculated when a plurality of scans is made, e.g. six. In this example, the nose position detected on each of the six longitudinal scans is retrieved. These data are then transformed to the thread reference frame and averaged to get a single, more accurate, nose reference.
  • phase of the thread with respect to the device reference frame is retrieved from the spiral root scan and a longitudinal trajectory is set in the thread reference frame such that it passes through the measuring points determined in the inspection report for the measurement of the run-in. Similarly, a trajectory is set for the points defined for the measurement of the run-out.
  • L5 is the length to the beginning of the thread
  • L2 is the reference length for the thread diameter and ovality calculation
  • Lc is the minimum length where the thread parameters must fulfil the tolerances
  • L4 is the length to the end of roots and crests, which is lower than the pull-out length where the run-out is measured.
  • Determination of the taper is one operation of data analysis.
  • the equation that describes the outer surface of the cone thread is the following.
  • t thread R q - A • Z thread
  • t thread and Z thread are the radial and azimuth coordinates in the thread frame of reference
  • R 0 is the primitive radius
  • A is the taper of the pin threading.
  • the t vs. Z relationship from the root scan of the thread is used.
  • Data acquired previously between L5 and Lc, corresponding to segment 23 of the curve, is analyzed as shown in Figure 11 .
  • a linear fit is performed over these data 23 to calculate the slope, comprising the values of taper and of A.
  • the deviations of the data with respect to that linear fit are calculated.
  • Those deviations contain information regarding the machining process, e.g. the non-compensated forces due to the change in pipe stiffness along the thread object and the over tightening of the pipe on the lathe.
  • This information can be retrieved using a Fourier modal analysis as a function of the thread position. For example a large three-mode means overtightening of the pipe on the lathe, while a parabolic behaviour of the fundamental mode means that the tool was taken before the end of the Lc.
  • Full thread length corresponding to the segment 25 of the curve of figure 12 , is analysed considering the data gathered from the crest scanning.
  • Thread diameter and ovality are evaluated in two ways using the root spiral scan.
  • the data being analyzed are those comprised in the zone corresponding to L2 ⁇ 2 thread pitches. Root points defined in this zone, cf. Figure 13 (a) showing the thread lateral view in section , are linearly fitted, after which this fitted linear function is evaluated to obtain the radius.
  • Root points for each radius determination are performed on generatrices equally spaced, advantageously at angular distances 27 of three degrees.
  • data for each root are averaged considering a generatrix width 29 of typically, but not necessarily, 5 degrees, cf.
  • Figure 13 (b) showing a thread top view. This implementation is similar to the mill procedure used with the MRP gauge.
  • Another operation in the data analysis procedure is run-in evaluation and this is derived from a longitudinal scan done in respect of the thread reference frame.
  • Figure 14 shows one of these scans which details the region in which the run-in is calculated.
  • Yet another operation is a pitch determination wherein the load flanks generated from the longitudinal scans are analysed.
  • the vectors containing the load flank values for each longitudinal scan are truncated so as to keep the flanks between L5+pitch and Lc. Of these flanks just the flanks of type 0 are accepted. The remainder of the types are discarded, being considered unreliable as real load flank identifications.
  • Figure 15 shows a hypothetical longitudinal scan and the positions of the load flanks identified.
  • the curve C 1 is how this would be if expressed in a measurement device reference frame where the effect of misalignment is noticed in the curvature (quadratic form) of the flank position trend, due to "falling-off" of the thread generatrix. This effect is also visible in the increasing separation between flank positions as the Z scan position grows.
  • the order in which the operations are made can vary as well as the number of operations, depending on the necessities and on the parameters to be measured.
  • the completeness of the measurement operation provides also for a calibration of the measurement device before starting operation of the system after set up.
  • the data points obtained in the longitudinal scan can be further analysed to obtain the value of the step height.
  • Data close to the edges are discarded and a linear fit between consecutive crests is performed, cf. figure 16 .
  • the fit is compared to the linear fit of the root and its depth is evaluated by calculating the distance between the line y2 at the center of the root.
  • a similar procedure is performed to calculate the height of the crests, taking y1 as the center of the crest. From the depth and height of the roots and crests, the average and standard deviation are calculated, the incomplete steps are identified and the length of the thread estimated.
  • step height in this case in a global manner, is to subtract a linear fit obtained from the crest and root spiral trajectories. This gives the difference between the inner and outer cones that represents the value of the step height.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
EP08170841A 2008-12-05 2008-12-05 Measurement method and device for thread parameters Revoked EP2194358B1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
EP08170841A EP2194358B1 (en) 2008-12-05 2008-12-05 Measurement method and device for thread parameters
PCT/EP2009/066309 WO2010063792A1 (en) 2008-12-05 2009-12-03 Measurement method and device for thread parameters
US13/131,851 US8682465B2 (en) 2008-12-05 2009-12-03 Measurement method and device for thread parameters
BRPI0923148-0A BRPI0923148B1 (pt) 2008-12-05 2009-12-03 Método de medição de parâmetros de rosca e dispositivo de medição
JP2011539025A JP5937356B2 (ja) 2008-12-05 2009-12-03 ねじパラメーター測定の方法及びデバイス
RU2011127489/28A RU2477453C1 (ru) 2008-12-05 2009-12-03 Устройство и способ измерения параметров резьбы
EP09795954A EP2373953B1 (en) 2008-12-05 2009-12-03 Measurement method and device for thread parameters
CA2746712A CA2746712C (en) 2008-12-05 2009-12-03 Measurement method and device for thread parameters
CN200980149000.5A CN102239385B (zh) 2008-12-05 2009-12-03 螺纹参数的测量方法和装置
MX2011005946A MX2011005946A (es) 2008-12-05 2009-12-03 Metodo de medicion para parametros de roscas.
ARP090104701A AR074546A1 (es) 2008-12-05 2009-12-04 Metodo de medicion de los parametros de rosca

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Application Number Priority Date Filing Date Title
EP08170841A EP2194358B1 (en) 2008-12-05 2008-12-05 Measurement method and device for thread parameters

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EP2194358A1 EP2194358A1 (en) 2010-06-09
EP2194358B1 true EP2194358B1 (en) 2011-06-01

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EP08170841A Revoked EP2194358B1 (en) 2008-12-05 2008-12-05 Measurement method and device for thread parameters
EP09795954A Active EP2373953B1 (en) 2008-12-05 2009-12-03 Measurement method and device for thread parameters

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US (1) US8682465B2 (ru)
EP (2) EP2194358B1 (ru)
JP (1) JP5937356B2 (ru)
CN (1) CN102239385B (ru)
AR (1) AR074546A1 (ru)
BR (1) BRPI0923148B1 (ru)
CA (1) CA2746712C (ru)
MX (1) MX2011005946A (ru)
RU (1) RU2477453C1 (ru)
WO (1) WO2010063792A1 (ru)

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US9400162B2 (en) 2011-12-29 2016-07-26 Valloure Oil And Gas France Device for measuring an internal or external profile of a tubular component

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CA2746712A1 (en) 2010-06-10
US8682465B2 (en) 2014-03-25
EP2373953A1 (en) 2011-10-12
RU2011127489A (ru) 2013-01-10
CN102239385B (zh) 2013-05-01
EP2373953B1 (en) 2012-11-21
JP2012511143A (ja) 2012-05-17
BRPI0923148B1 (pt) 2019-07-02
JP5937356B2 (ja) 2016-06-22
WO2010063792A1 (en) 2010-06-10
RU2477453C1 (ru) 2013-03-10
MX2011005946A (es) 2011-11-02
EP2194358A1 (en) 2010-06-09
US20110238199A1 (en) 2011-09-29
CA2746712C (en) 2014-10-14
AR074546A1 (es) 2011-01-26

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